The ergonomic AERObag® - BM06-HV2000E PVC hyperventilation mask is ideal for optimal therapy by re-breathing treating hyperventilation syndrome. The mask is soft and seals well with a 2000ml re-breathing volume. It provides superior quality with low pricing. There is no risk of cross infection, no reprocessing cost, and it uses medical PVC. They are hygienically packed individually. The design is easy to use, with adjustable head strap, wide nose clip and anatomical fit. Comes with detailed instructions.